9. The earth _________ the sun once every 365 days. A. circles B. is circling C. circling D. is going to circle 10. The exam was much __________ than we expected. A. more difficult B. most difficult C. difficulter D. difficult

9. A

Thì hiện tại đơn:

- Động từ thường

(+) S + V (es,s) + O

(-) S + doesn't / don't + V + O

(?) Do / Does + S + V + O

- Tobe:

(+) She / He / It + is

They / We / You + are

I + am

(-) She / He / It + isn't

They / We / You + aren't

I + am not

(?) She / He / It + Is

They / We / You + Are

I + Am

- Dấu hiệu: Always ; Usually ; Never;....

10. A

So sánh hơn:

- Tính từ ngắn: S1 + tobe + adj + er + than + S2

- Tính từ dài: S1 + tobe + more + adj + than + S2